export declare const TESTABLE_REQUIRE_REFERENCE: NodeJS.Require | undefined;
/**
 * Returns the file path of the main application entry point.
 *
 * - Uses require.main.filename (CommonJS) as primary source
 * - Falls back to process.argv[1] for ESM or worker threads
 * - Returns null in REPL or bundlers
 */
export declare function getApplicationPath(): string | null;